ISOTOPES.pptx
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The document discusses the periodic table and properties of elements in different groups. It defines isotopes and explains how elements are arranged based on atomic number. Elements in the same group have similar properties like valence electrons and reactivity. Properties also change periodically down each group as atomic size increases. Metals are on the left, nonmetals on the right, with transition metals in the middle and noble gases on the far right. Videos are linked to explain properties of different groups like alkali metals, alkaline earth metals, and halogens.
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The document summarizes key sections on the development and classification of the periodic table. It discusses how the periodic table evolved over time as scientists organized the known elements. Key developments included Lavoisier compiling the first list of elements in the 1700s, Newlands proposing arrangement by atomic mass in the 1800s, and Moseley rearranging by atomic number resulting in clear periodic trends. The modern periodic table is organized into blocks based on electron configuration, including s, p, d and f blocks. It also describes periodic trends in properties like atomic radius, ionization energy, and electronegativity that relate to an element's position on the table.
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The periodic table organizes elements according to increasing atomic number and displays recurring trends in their chemical and physical properties. Dmitri Mendeleev arranged the elements in order of atomic mass, leaving gaps for undiscovered elements, while Henry Moseley determined that atomic number best indicates an element's position. Elements are classified as metals, nonmetals, and metalloids based on their locations, and each element's unique properties derive from its number of protons and valence electrons.
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1. Dmitri Mendeleev created one of the first periodic tables by arranging the elements in order of increasing atomic mass. He noticed that elements seemed to repeat properties every eighth element.
2. Mendeleev arranged the elements into groups with similar properties and left gaps for elements that had not yet been discovered. The periodic table was later reorganized by atomic number.
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The document discusses the periodic trends and organization of the elements. It begins by providing examples of element electron configurations and how they show periodicity. It then discusses early attempts to organize the elements and credit Dmitri Mendeleev with developing the first successful periodic table in 1869 based on similarities in properties and atomic mass. The periodic law states that elements arranged by increasing atomic number show a repeating pattern of properties. The document outlines how the periodic table groups elements into families with similar properties and periods of the same energy level. It describes the major categories of elements as metals, nonmetals, and metalloids and how their locations are indicated on the periodic table. Specific element groups are also characterized including the alkali metals, alkaline earth
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The document summarizes the development and key features of the periodic table. It discusses how early chemists like Newlands, Meyer, and Mendeleev arranged elements in order of atomic mass and properties, recognizing repeating patterns. Mendeleev predicted new elements and Moseley later arranged elements by atomic number. The periodic table is organized into blocks by electron configuration and periods and groups that demonstrate trends in properties. Metals are on the left, nonmetals on the right, and metalloids border the stair-step line between them.
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This document provides information about the periodic table. It explains that the periodic table organizes all known elements based on their atomic number and chemical properties. It defines key terms like atomic number, atomic mass, periods and groups. It describes the trends in chemical properties across different regions of the periodic table, including metals, nonmetals and metalloids. Specific groups like alkali metals, alkaline earth metals, halogens and noble gases are highlighted with examples.
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1. Dimitri Mendeleev was the first to publish an organized periodic table and predicted the properties of undiscovered elements.
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The document discusses the periodic table, including its organization, development, and the information it provides about elements. It explains that the periodic table arranges elements in rows and columns based on atomic number and properties, allowing predictions about undiscovered elements. Each square lists an element's atomic number, symbol, name, and average atomic mass. The periodic table is organized into periods, groups/families that share similar characteristics, and nonmetals, metals and metalloids.
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This document provides information about the periodic table. It explains that the periodic table organizes all known elements based on their atomic number and chemical properties. It defines key terms like atomic number, atomic mass, periods and groups. It describes the trends in chemical properties across different regions of the periodic table, including metals, nonmetals and metalloids. Specific groups like alkali metals, alkaline earth metals, halogens and noble gases are highlighted with examples.
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The document summarizes key concepts about organizing elements in the periodic table and periodic trends. It explains that elements are organized based on their atomic number and electron configuration into groups with similar properties. Periodic trends are discussed, including how atomic size decreases left to right across a period but increases down a group, and how ionization energy and electronegativity increase left to right and decrease down a group. Cations are smaller than their parent atoms while anions are larger.
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The document discusses key aspects of the periodic table, including its structure, properties of different groups of elements, and how position on the table relates to electron configuration and chemical properties. It provides details on the alkali metals, halogens, and noble gases groups, describing their physical and chemical characteristics. Examples are given of elements in each group to illustrate trends in properties.
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The document discusses the history of the periodic classification of elements from early systems proposed by Lavoisier, Dalton, Dobereiner, and Newlands to Mendeleev's periodic table. It outlines some of the key developments and properties used in their classification schemes, including atomic weight and electronic configuration. The modern periodic table is based on atomic number according to Moseley's discovery that properties are periodic functions of atomic number rather than atomic weight. The document also discusses periodic trends in properties like atomic radius, metallic character, electronegativity, and their relationship to position in the periodic table.
Periodic table notes
- Dmitri Mendeleev organized the elements into the periodic table based on their atomic mass and recognized repeating patterns in their properties. He left space for undiscovered elements.
- Henry Moseley determined that atomic number, the number of protons, allowed elements to be organized into a definite pattern according to the periodic law where chemical and physical properties repeat periodically with increasing atomic number.
- The periodic table arranges elements by atomic number and provides information on each element including name, symbol, atomic number, atomic mass, and whether they are metals, nonmetals, or metalloids.
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This document provides information about the periodic table and periodic trends. It discusses the organization of the periodic table into rows (periods) and columns (groups/families) and explains how elements in the same group have similar properties based on their electron configuration. Periodic trends are covered, including how atomic radius decreases across a period as effective nuclear charge increases, and how ionization energy and electron affinity vary periodically. Metals, nonmetals, and metalloids are defined based on their characteristic properties.
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Delve deeper into the presentation and unlock a wealth of knowledge about each element. Discover their unique characteristics, such as their physical and chemical properties, common uses, and even their historical significance. Engaging narratives and captivating illustrations bring the elements to life, making the learning experience both enjoyable and informative.
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What is greenhouse gasses and how many gasses are there to affect the Earth.
What is greenhouse gasses and how many gasses are there to affect the Earth.
aziz sancar nobel prize winner: from mardin to nobel
aziz sancar nobel prize winner: from mardin to nobel
Cytokines and their role in immune regulation.pptx
Cytokines and their role in immune regulation.pptx
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bordetella pertussis.................................ppt
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
THEMATIC APPERCEPTION TEST(TAT) cognitive abilities, creativity, and critic...
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ESR spectroscopy in liquid food and beverages.pptx
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The use of Nauplii and metanauplii artemia in aquaculture (brine shrimp).pptx
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
Unlocking the mysteries of reproduction: Exploring fecundity and gonadosomati...
The debris of the ‘last major merger’ is dynamically young
The debris of the ‘last major merger’ is dynamically young
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
Sharlene Leurig - Enabling Onsite Water Use with Net Zero Water
ISOTOPES.pptx
- 1. ISOTOPES & The Periodic table LEARNING OBJECTIVES: Define Isotopes Compare the properties of isotopes Research on some applications of isotopes Describe the positions of different elements on the periodic table. https://www.youtube.com/watch?v=fLSfgNxoVGk
- 2. Alkali metals • Alkaline metals : belong to the first Vertical column - GROUP 1 • Carefully observe the video • https://www.youtube.com/watch?v=6ZY6d6jrq-0 • Predict some general properties of this Group • How many valence electrons do they have? ____________ • Whom do they quickly react with? _____________ • As we move down a group it is seen that the _____________________ increases
- 3. Alkaline earth metals • Alkaline metals : belong to the first Vertical column - GROUP 2 Carefully observe the video • https://www.youtube.com/watch?v=Q_8OVgEDu8s • Predict some general properties of this Group • How many valence electrons do they have? ____________ • Are they more reactive than Alkali metals? _____________ • As we move down a group it is seen that the _____________________ increases
- 4. Noble gases • Noble gases: belong to the last Vertical column - GROUP 8 Carefully observe the video • https://www.youtube.com/watch?v=g3xBsqAU39c • Predict some general properties of this Group • How many valence electrons do they have? ____________ • Are they reactive ? _____________
- 5. Properties of a Group • All elements in the same group have same outer electronic configurations so have similar chemical properties. • They all have the same valency. • If the properties of 1 element in the group is known , then we can predict the properties of all other elements on the group. • As we move down a group , the no of electronic shells increases. Properties of a Period • On moving from left to right of the period all elements have increasing atomic numbers . • Electrons are added to the same shell. • On moving from left to right of the period, the metallic properties decrease and non-metallic properties increase.
- 6. General properties • Properties of elements repeat at regular intervals • Hence called periodic table. • The elements are arranged on the basis of their increasing atomic numbers. • Metals ( alkali and alkaline earth metals ) are placed on the extreme left of the table. • Transition metals are placed at the center of the table. • Non-metals are placed on the right hand corner of the table. • Noble gases are placed to the extreme right of the table.
- 7. Metalloids • Metalloids: show prpoperties of both metals and non metals • https://www.youtube.com/watch?v=TcvMroyYaW0 • Predict some general properties of this Group • How many valence electrons do they have? ____________ • Are they reactive ? _____________
- 8. Halogens • Halogens: belong to the second last Vertical column - GROUP 7 Carefully observe the video • https://www.youtube.com/watch?v=HT1zAPQIBAQ • https://www.youtube.com/watch?v=u2ogMUDBaf4 • Predict some general properties of this Group • How many valence electrons do they have? ____________ • How many electrons do they need to become stable ? ____________ • Are they reactive ? _____________